We need to build a run. We have a chain-link fence and turkey wire to do so. We were thinking of putting up a perimeter of at least 4ft high around the coop. We may put wire up around the edges of the run at an inward angle, which would cover the run just at the perimeter. Is it essential that we cover the entire run if we keep the chickens securely in the coop at night? We live in downtown Denver so our biggest concerns would be raccoons and foxes. Our neighbor has a dog which may deter predators a bit. Any advice?